Not to be confused with Joule/second.

The joule-second (J s or Jยทs) is a unit equal to a joule multiplied by a second, used to measure action. The action of a system has the dimensions of energy integrated over time; it is therefore measured in joule-seconds. The joule-second is the unit used for Planck's constant.

In SI base units, the joule-second is

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